Fraunhofer-Publica
The Fraunhofer-Publica has been successfully documenting the research results of the Fraunhofer-Gesellschaft for over 30 years. The platform enables the collaborative linking of research-relevant objects and disseminates within the international scientific community.
The Fraunhofer-Publica thus fulfils its responsibility to promote the transfer of knowledge and know-how to industry and society.
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Research outputs
As an application-oriented research organisation, Fraunhofer aims to conduct highly innovative and solution-oriented research - for the benefit of society and to strengthen the German and European economy.
Projects
Fraunhofer is tackling the current challenges facing industry head on. By pooling their expertise and involving industrial partners at an early stage, the Fraunhofer Institutes involved in the projects aim to turn original scientific ideas into marketable products as quickly as possible.
Researchers
Scientific achievement and practical relevance are not opposites - at Fraunhofer they are mutually dependent. Thanks to the close organisational links between Fraunhofer Institutes and universities, science at Fraunhofer is conducted at an internationally first-class level.
Institutes
The Fraunhofer-Gesellschaft is the leading organisation for applied research in Europe. Institutes and research facilities work under its umbrella at various locations throughout Germany.
Recent Additions
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PublicationUsing Discrete Element Method for Simulating Robotic Structures with Particle Jamming Characteristics( 2024)In this paper, we use the Discrete Element Method (DEM) to model the switchable stiffness behavior of components for robotic structures. These components are built-up with an elastic cover and a granular medium. By means of vacuum pressure, the jamming of the particles, and therefore the stiffness be-havior, can be adjusted. Aim of the model is to predict the structural behavior of such components considering size scaling effects. The model is compared to ex-perimental results of a bending test. Main challenges of using the DEM for such a configuration is the mapping of the elastic cover and the load application. The load application can be realized by coupling with a multibody dynamics system using the Functional Mock-up Interface. For mapping the cover, the elasticity has to be adjusted because of numerical discrepancies. The comparison with the ex-perimental results shows that the influence of the cover elasticity is negligibly small. The differences between simulation and experiment can be explained by the particle shape. To save computing time, sphere shapes are considered for the model, but the real particle shapes are sharp-edged polyhedrons. With the model the influence of parameters such as dimensions, filling degree and vacuum pres-sure can be determined.
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PublicationA smallest computable entanglement monotone( 2022)The Rains relative entropy of a bipartite quantum state is the tightest known upper bound on its distillable entanglement - which has a crisp physical interpretation of entanglement as a resource - and it is efficiently computable by convex programming. It has not been known to be a selective entanglement monotone in its own right. In this work, we strengthen the interpretation of the Rains relative entropy by showing that it is monotone under the action of selective operations that completely preserve the positivity of the partial transpose, reasonably quantifying entanglement. That is, we prove that Rains relative entropy of an ensemble generated by such an operation does not exceed the Rains relative entropy of the initial state in expectation, giving rise to the smallest, most conservative known computable selective entanglement monotone. Additionally, we show that this is true not only for the original Rains relative entropy, but also for Rains relative entropies derived from various Rényi relative entropies. As an application of these findings, we prove, in both the non-asymptotic and asymptotic settings, that the probabilistic approximate distillable entanglement of a state is bounded from above by various Rains relative entropies.Full version available at https://arxiv.org/abs/2201.00835
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